How to Plumb a 3 Compartment Sink: 6 Best Steps

It is now a modern reality that homeowners or business owners find ease in all aspects of their daily routines. In the last few years, the popularity of the three-compartment sink has skyrocketed for both farmhouses and homes as well as businesses who install kitchens. Everything has to be maintained and repaired as it ages.

As a result, if you are using a 3 compartment sink at your farmhouse or workplace, you may need to learn about how to plumb a 3 compartment sink if you have a plumbing problem.

How to plumb a 3 compartment sink

There is a slight difficulty in the plumbing of the three compartment kitchen sink as compared to any other sink.

As a general rule, once you are aware of the layout of sink pipes, you will be able to pipe up a 3 compartment sink with little difficulty.

These types of sink plumbing may vary depending on the sink’s manufacturer or its design. Further, it is always a smart idea to seek advice from a professional plumber before you begin any process.

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Step by Step Guide : How To Plumb a 3 Compartment Sink | 6 Best Methods

How to plumb a 3 compartment sink

Step 1: Prepare the pipe path

  • In order to begin, we first need to design the path of the pipe, the first step.
  • Confirm that the drain pipe extends about 2 inches below the floor from the primary waste stack to the sink cabinet.
  • You need to ensure that your pipe is laid on the shortest possible path before you remove the flooring.
  • After the pipe has been inserted into the cabinet housing the three compartment sink, the pipe needs to be increased up to about 5 inches below the sink to allow adequate ventilation.

Step 2: Check all pieces of the 3 compartment sink

  • The second thing we have to do is to check our inventory of sink plumbing components.
  • Generally, under an installed three-compartment sink, we will see elbows, drain tailpieces, and a center tee.
  • Using the tailpieces of the two drains, you will be able to connect the center tee to the center drain.
  • In addition, the elbow section will join the left and right bowls.

Step 3: Mark the cut lines for cutting the two pipes

  • In order to insert the drain, you must first insert its tailpiece along with it.
  • You must then attach the P-trap assembly to the tailpiece of the drain.
  • Secondly, you will need to connect the end path of the P-trap to the PVC extension pipe.
  • You should move the P-trap and PVC extension to the drain pipe until they are in contact.
  • Once this has been done, mark the locations where the pipes are to be cut.
  • After you have made the marks, the drainpipe should be cut. This can be achieved with a hacksaw, which is the most suitable equipment for this job.
  • The most suitable tool to use for this is a hacksaw. If any burrs are present, be sure to remove them using sandpaper.

Step 4: Trim the PVC pieces

  • You will need to cut the PVC pipe along the marked lines. Following the trimming of the pipe, it is necessary to smooth it with sandpaper after it has been cut.
  • This will help to ensure that the pipe will not have a burr in it.
  • Be sure to concentrate on the fact that the cut piece of PVC pipe will join in those areas that have been marked.
  • The next step is to determine the exact location of the wall drain.
  • It is possible to install a center-set drain directly with a P-trap kit, thus we do not need any additional equipment.
  • Further, in the case of offset drains, it would be wise to install a P-trap kit first, after which a flexible hose can be extended outside the wall, in order to drain the water.
  • Ideally, this type of drain would be flexible enough to align with wall outlets.

Step 5: Installing of PVC P-trap and the sanitary tee

  • We now need to install the sanitary tee and the PVC p-trap that will go with it.
  • In order for the Tee to function properly, its outlet should be directed towards the P-trap, while the sweep faces up.
  • It is important to remember that the extension pipe will have the same diameter as the outlet pipe.
  • In order to join the drain pipe and the tee, PVC cement needs to be used.
  • The connection between the extension pipe and tee needs to be tightened.
  • It is imperative to align the P-trap kit on the centre-set tail with the wall so that it becomes a p-trap at the bottom of the tail.
  • In case of need, you can attach the tail extension to the bottom of the sink drain.

Step 6: Check for leaks

  • Finally we have completed the plumbing of the 3 compartment sink, we can now move on to the inspection of leaks.
  • It is advisable to tighten up all the connections in the joint if there is any leakage in it.


As we can see from the steps above, the installation and plumbing of a three compartment sink is actually a relatively easy process that can be done by anyone.

You can decide to do the work yourself if you want, or, if you don’t want to do it yourself, you can hire a plumber.

In my opinion, installing a three compartment kitchen sink is far more beneficial than installing one that has only one compartment. As a result, you will be able to save a considerable amount of space when you are doing washing.

In the process of doing the washing, the first compartment assists you in scrubbing, the second compartment assists you in rinsing. The third compartment will aid you in maintaining cleanliness.

You can accomplish anything if you understand how to do it.

You will never be able to complete a task successfully if you do not have a proper guideline. You have found the right place where you can get all the necessary information on how to plumb a 3 compartment sink.

So now you can easily fix the problem, and now you can plug your three compartment sink to make it more effective.

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